In a small island off the American coast, the Whateleys live in an old mill where a mysterious bloody being creates an atmosphere of horror. After her parents get killed by lightning, young Susannah is sent to New York by her aunt Agatha, who wants her to avoid the family curse. Years later Susannah, now married, persuades her husband to spend a holiday in the abandoned mill. Once on the island, Susannah and Mike soon find themselves exposed to the hostility of a gang of thugs led by Ethan, Susannah's brutal cousin.
Unfortunately the movie The Shuttered Room is not yet available on HBO Max.
| Directing | David Greene | Director |
| Camera | Ken Hodges | Director of Photography |
| Costume & Make-Up | Caroline Mott | Costume Design |
| Writing | H.P. Lovecraft | Book |
| Writing | August Derleth | Book |
| Writing | D.B. Ledrov | Writer |
| Writing | Nat Tanchuck | Writer |
| Sound | Jack Harding | Original Music Composer |
| Editing | Brian Smedley-Aston | Editor |
| Sound | Don Challis | Sound Editor |
| Production | Bernard Schwartz | Executive Producer |
| Costume & Make-Up | Eileen Warwick | Hairdresser |
| Sound | Kevin Sutton | Sound Mixer |
| Costume & Make-Up | Hylan Booker | Costume Designer |
| Sound | Basil Kirchin | Original Music Composer |
| Costume & Make-Up | Harry Frampton | Makeup Artist |
| Production | Alexander Jacobs | Associate Producer |
| Art | Brian Eatwell | Art Direction |
| Production | Phillip Hazleton | Producer |
| Production | Frederick Yale | Casting |
| Camera | Herbert Smith | Camera Operator |
